/Engine/Source/Runtime/GeometryCore/Public/CompGeom/ConvexDecomposition3.h
Compact the decomposition representation to the minimal needed for output: Just the hull vertices and triangles, no internal geometry This will prevent some further processing on the representation; to ensure it is called only when the geometry is no longer needed, instead of calling this directly, call MergeBest with bAllowCompact=true
void Compact()